An attendant circumstance utilization device provides a function of equipment and a content appropriate to a user by considering the attendant circumstance by whom the user is accompanied, and includes an attendant ID detecting unit (101) to detect an attendant information (attendant ID) indicating by whom the user is accompanied and an equipment operation detecting unit (103) to detect an equipment operation. A history data of an attendant ID is stored in an attendant ID database (102) and a history data of an equipment operation is stored in an operation history database (104) respectively by correlating with a time of detection. An equipment operation activity particular to the user who was accompanied by the current attendant in the past time is judged by an attendant circumstance dependent operation activity judging unit (105) based on the attendant ID newly detected by the attendant ID detecting unit (101), the history data of the attendant ID in the attendant ID database (102) and the equipment operation history data in the operation history database (104). A function/content providing unit (106) provides the user with a function of equipment and a content depending on the particular equipment operation activity.